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Symptom: PCM MESSAGES NOT RECEIVED POSSIBLE CAUSES PCM MESSAGES NOT RECEIVED ATTEMPT TO COMMUNICATE WITH THE PCM PCI BUS CIRCUIT OPEN POWERTRAIN CONTROL MODULE TEST ACTION APPLICABILITY 1 Turn the ignition on. t, enter Body Computer, System Tests then PCM Monitor. Does the DRB III t display: PCM is active on BUS? All Yes → Replace the Central Timer Module. No → 2 Turn the ignition on. t, attempt to communicate with the PCM. Was the DRB III t able to communicate with the PCM? All Yes → No → Refer to the communication category and perform the appropriate 3 Turn the ignition off. t. Measure the resistance of the PCI Bus circuit between the diagnostic junction port All Yes → Replace the Powertrain Control Module. No → Repair the PCI Bus circuit for an open. 40 COMMUNICATION |